CN111740030A

CN111740030A - Display panel, display device and manufacturing method of display panel

Info

Publication number: CN111740030A
Application number: CN202010621679.1A
Authority: CN
Inventors: 于泉鹏; 张卿
Original assignee: Shanghai Tianma Microelectronics Co Ltd
Current assignee: Shanghai Tianma Microelectronics Co Ltd
Priority date: 2020-06-30
Filing date: 2020-06-30
Publication date: 2020-10-02
Anticipated expiration: 2040-06-30
Also published as: CN111740030B; US20210408501A1; US11374206B2

Abstract

The invention describes a display panel, a display device and a manufacturing method of the display panel. The display panel is divided into a display area and a non-display area surrounding the display area; the display panel includes: the array substrate, the display layer and the packaging layer are arranged in sequence; the ink layer is positioned in the non-display area and surrounds the display area; the ink layers at least comprise a first ink layer and a second ink layer which are positioned on different layers; the orthographic projection of the first ink layer on the substrate is a non-closed pattern surrounding the display area; the orthographic projection of the second ink layer on the substrate is a non-closed pattern surrounding the display area. The invention also provides a manufacturing method of the display panel and a display device comprising the display panel. The invention can shield the non-display area and solve the problem of warping or bending of the flexible display panel.

Description

Display panel, display device and manufacturing method of display panel

Technical Field

The present invention relates to the field of display, and in particular, to a display panel, a display device, and a method for manufacturing the display panel.

Background

The flexible display panel is a flexible display device, and has the advantages of convenience for carrying, bending and curling, and the like, so that the flexible display panel is a hot spot for research and development in the current display technology.

For the flexible display panel, when the state of the flexible display panel is changed, the problems of film separation, crack generation, disconnection and the like can be caused, so that the normal display of the flexible display panel is influenced, and the service life of the flexible display panel is reduced.

Disclosure of Invention

In view of the foregoing, the present invention provides a display panel, a method for manufacturing the display panel, and a display device including the display panel.

The invention provides a display panel, which is divided into a display area and a non-display area surrounding the display area;

the display panel includes: the array substrate, the display layer and the packaging layer are arranged in sequence;

the ink layer is positioned in the non-display area and surrounds the display area;

the ink layers at least comprise a first ink layer and a second ink layer which are positioned on different layers;

the orthographic projection of the first ink layer on the substrate is a non-closed pattern surrounding the display area; the orthographic projection of the second ink layer on the substrate is a non-closed pattern surrounding the display area.

The invention also provides a manufacturing method of the display panel, which comprises the substrate, the array layer, the display layer and the packaging layer which are arranged in sequence;

the printing ink layer is formed in a silk-screen printing mode.

The invention also provides a display device comprising the display panel.

The invention can shield the non-display area and solve the problem of warping or bending of the flexible display panel.

Drawings

Fig. 1 is a top view of a display panel according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1;

FIG. 4 is a partial cross-sectional view of the display panel of FIG. 1;

fig. 5 is a top view of a first ink layer of a display panel according to an embodiment of the present invention;

fig. 6 is a top view of a second ink layer of a display panel according to an embodiment of the present invention;

FIG. 7 is another cross-sectional view taken along line A-A of FIG. 1;

FIG. 8 is another cross-sectional view taken along line B-B of FIG. 1;

FIG. 9 is a schematic cross-sectional view of the bezel of the display panel of FIG. 1 extending along a direction perpendicular to the bending axis;

FIG. 10 is a schematic view of the display panel of the cross-section of FIG. 9 in a bent state;

FIG. 11 is a schematic cross-sectional view of a bezel of the display panel of FIG. 1 extending along a direction perpendicular to the bending axis;

FIG. 12 is a schematic cross-sectional view of the display panel of FIG. 11 in a bent state;

FIG. 13 is a schematic cross-sectional view of a bezel of the display panel of FIG. 1 extending along a direction perpendicular to the bending axis;

FIG. 14 is a cross-sectional view of the display panel in FIG. 1 in a bent state along the dotted line S in FIG. 1;

FIG. 15 is a schematic cross-sectional view of a bezel of the display panel of FIG. 1 extending along a direction perpendicular to the bending axis;

FIG. 16 is a schematic cross-sectional view of a bezel of the display panel of FIG. 1 extending along a direction perpendicular to the bending axis;

FIG. 17 is a schematic cross-sectional view of a bezel of the display panel of FIG. 1 extending along a direction perpendicular to the bending axis;

FIG. 18 is a flowchart illustrating a method for fabricating a display panel according to an embodiment of the present invention;

fig. 19 is a schematic structural diagram of a display device according to an embodiment of the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, the present invention is further described with reference to the accompanying drawings and examples.

It should be noted that in the following description, specific details are set forth in order to provide a thorough understanding of the present invention. The invention can be implemented in a number of ways different from those described herein and similar generalizations can be made by those skilled in the art without departing from the spirit of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be noted that the terms "upper", "lower", "left", "right", and the like used in the description of the embodiments of the present invention are used in the angle shown in the drawings, and should not be construed as limiting the embodiments of the present invention. In addition, in this context, it is also to be understood that when an element is referred to as being "on" or "under" another element, it can be directly formed on "or" under "the other element or be indirectly formed on" or "under" the other element through an intermediate element.

Also, the example embodiments may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted. The words expressing the position and direction described in the present invention are illustrated in the accompanying drawings, but may be changed as required and still be within the scope of the present invention. The drawings of the present invention are only for illustrating the relative positional relationship, the layer thicknesses of some parts are exaggerated in a drawing manner for easy understanding, and the layer thicknesses in the drawings do not represent the proportional relationship of the actual layer thicknesses. And features in the embodiments and embodiments of the present invention may be combined with each other without conflict. The figures of the various embodiments in this application follow the same reference numerals. In addition, the same parts of the embodiments are not described again.

Referring to fig. 1 to 3, fig. 1 is a top view of a display panel according to an embodiment of the present invention, fig. 2 is a cross-sectional view taken along a line a-a in fig. 1, and fig. 3 is a cross-sectional view taken along a line B-B in fig. 1, where the cross-section is perpendicular to a plane of the display panel.

Alternatively, the display panel 100 is divided into a display area AA and a non-display area NA surrounding the display area AA. It is understood that the dashed box in fig. 1 is used to illustrate the boundary between the display area AA and the non-display area NA. The display area AA is an area of the display panel for displaying a picture, and generally includes a plurality of pixel units (as illustrated by a plurality of small rectangles in the display area AA in the figure), each of which includes a light emitting device (e.g., a diode) and a control element (e.g., a thin film transistor constituting a pixel driving circuit) corresponding to the pixel unit. The non-display area NA surrounds the display area AA, and typically includes peripheral driving elements, peripheral traces, and a fan-out area.

The display panel 100 includes: a substrate 110, an array layer 200, a display layer 300, and an encapsulation layer 400 are sequentially disposed. It is understood that the substrate 110, the array layer 200, and the display layer 300 together form a basic structure of the display panel, and the substrate 110, the array layer 200, and the encapsulation layer 400 enclose the display layer 300 in a closed space. In the embodiment of the present application, a panel composed of the substrate 110, the array layer 200, the display layer 300, and the encapsulation layer 400 is defined as a basic display panel.

The underlying display panel composition of the application will now be described in detail. Please refer to fig. 4, which is understood together with other figures of the present embodiment. Fig. 4 is a partial cross-sectional view of the display panel of fig. 1.

Specifically, the display panel 100 includes a substrate 110; wherein the substrate 110 (i.e., substrate base) may be flexible and thus stretchable, foldable, bendable, or rollable, such that the flexible display panel may be stretchable, foldable, bendable, or rollable. The substrate 110 may be formed of any suitable insulating material having flexibility. The substrate 110 serves to block oxygen and moisture, prevent moisture or impurities from diffusing through the flexible base, and provide a flat surface on an upper surface of the flexible base. For example, it may be formed of a polymer material such as Polyimide (PI), Polycarbonate (PC), Polyethersulfone (PES), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), Polyarylate (PAR), or glass Fiber Reinforced Plastic (FRP), and the substrate 110 may be transparent, translucent, or opaque. Alternatively, the display panel may further include a buffer layer (not shown) on the substrate 110, and the buffer layer may cover the entire upper surface of the substrate.

Optionally, a Back Plate Film (Back Plate Film) is further disposed under the substrate 110 to protect the lower surface of the display panel.

An array layer 200 on the substrate 110; the particular array layer 200 is located on the side of the substrate 110 facing the display or touch surface of the display panel 100. The array layer 200 may include a plurality of Thin Film transistors 210 (TFTs) and pixel circuits configured by the TFTs, for light emitting parts in the display layer.

The embodiment of the present invention will be described with reference to a top gate thin film transistor as an example. Thin-film-transistor layer 210 includes: an active layer on the substrate 110. The active layer may be an amorphous silicon material, a polysilicon material, a metal oxide material, or the like. When the active layer is made of polycrystalline silicon material, the active layer can be formed by adopting a low-temperature amorphous silicon technology, namely, the amorphous silicon material is melted by the laser to form the polycrystalline silicon material. In addition, various methods such as a Rapid Thermal Annealing (RTA) method, a Solid Phase Crystallization (SPC) method, an Excimer Laser Annealing (ELA) method, a Metal Induced Crystallization (MIC) method, a Metal Induced Lateral Crystallization (MILC) method, or a Sequential Lateral Solidification (SLS) method may also be used. The active layer further includes source and drain regions formed by doping N-type impurity ions or P-type impurity ions, and a channel region is formed between the source and drain regions.

A gate insulating layer on the active layer. The gate insulating layer includes an inorganic layer such as silicon oxide, silicon nitride, and may include a single layer or a plurality of layers.

And a gate electrode on the gate insulating layer. The gate electrode may include a single layer or a plurality of layers of gold (Au), silver (Ag), copper (Cu), nickel (Ni), platinum (Pt), palladium (Pd), aluminum (Al), Molybdenum (MO), or chromium (Cr), or a material such as aluminum (Al): neodymium (Nd) alloy and Molybdenum (MO) alloy, tungsten (W) alloy.

An interlayer insulating layer on the gate electrode. The interlayer insulating layer may be formed of an inorganic layer of silicon oxide, silicon nitride, or the like. Of course, in other alternative embodiments of the present invention, the interlayer insulating layer may be formed of an organic insulating material.

And a source electrode and a drain electrode on the interlayer insulating layer. The source and drain electrodes are electrically connected (or coupled) to the source and drain regions, respectively, through contact holes formed by selectively removing the gate insulating layer and the interlayer insulating layer.

The array layer 200 may also include a passivation layer. Optionally, the passivation layer is located on the source electrode and the drain electrode of the thin film transistor. The passivation layer may be formed of an inorganic material such as silicon oxide or silicon nitride, or may be formed of an organic material.

The array layer 200 may also include a planarization layer. Optionally, the planarization layer is on the passivation layer. The planarization layer includes an organic material such as acryl, Polyimide (PI), benzocyclobutene (BCB), or the like, and has a planarization function to provide a flat bearing surface for the light emitting layer formed thereon.

A display layer 300 on a side of the array layer 200 facing away from the substrate 110. The display layer 300 includes a light emitting part. Optionally, the display layer 300 is on a planarization layer. The display layer 300 includes an anode layer, an organic light emitting material, and a cathode layer sequentially arranged in a direction away from the substrate 110. The display layer 300 further includes a pixel defining layer on a side of the anode layer remote from the array layer 200. The pixel defining layer may be formed of an organic material such as Polyimide (PI), polyamide, benzocyclobutene (BCB), acryl resin, or phenol resin, or an inorganic material such as SiNx.

Optionally, the anode layer includes a plurality of anode patterns corresponding to the pixels one to one, and the anode patterns in the anode layer are connected to the source electrode or the drain electrode of the thin film transistor 210 through the via holes on the planarization layer. The pixel defining layer includes a plurality of openings exposing the anode layer, and the pixel defining layer covers edges of the anode layer pattern. The organic light emitting material is at least partially filled in the opening of the pixel defining layer and is in contact with the anode layer.

Optionally, the anode layer, the organic light emitting material, and the cathode layer defined by the opening of each pixel defining layer constitute a light emitting component 310, each light emitting component 310 can emit light of different colors according to different organic light emitting materials, each light emitting component 310 constitutes a pixel (or each light emitting component and a pixel circuit controlling the light emitting component jointly constitute one pixel), and a plurality of pixels jointly display a picture.

Alternatively, the organic light emitting material may be formed in the opening of the pixel defining layer by using ink jet printing, nozzle printing, evaporation, or the like. The cathode layer can be formed on the film layer on which the organic light-emitting material is arranged by evaporation. Alternatively, the cathode layer may cover the entire surface of the organic light emitting material 320 and the pixel defining layer.

Optionally, the display panel 100 further includes an encapsulation layer 400 on the display layer 300 and completely covers the display layer 300 to seal the display layer 300. It will be understood that references to "on" in this embodiment are to be understood as being on the "side remote from the substrate".

Optionally, the encapsulation layer 400 is a thin film encapsulation layer, is located on the cathode layer, and includes a first inorganic encapsulation layer, a first organic encapsulation layer, and a second inorganic encapsulation layer, which are sequentially disposed along a direction away from the substrate 110. Of course, in other alternative embodiments of the present invention, the encapsulation layer may include any number of stacked organic and inorganic materials, as desired, but at least one layer of organic material and at least one layer of inorganic material are alternately deposited, and the lowermost layer and the uppermost layer are made of inorganic materials.

With continued reference to fig. 1-4, the display panel 100 further includes an ink layer 500 disposed in the non-display area NA and surrounding the display area AA.

Ink layer 500 includes at least a first ink layer 510 and a second ink layer 520 on different layers; that is, the ink layer 500 includes two ink layers, i.e., a first ink layer 510 and a second ink layer 520.

Wherein, the orthographic projection of the first ink layer 510 on the substrate 110 is a non-closed pattern surrounding the display area AA; the orthographic projection of the second ink layer 520 on the substrate 110 is a non-closed pattern surrounding the display area AA. Of course the pattern of the individual ink layers may be different.

Further, the ink layer 500 is an annular closed pattern as a whole. That is, the orthographic projections of the first ink layer 510 and the second ink layer 520 on the substrate 110 together form a closed pattern surrounding the display area AA. That is, the orthographic projections of the first ink layer 510 and the second ink layer 520 on the substrate 110 are integrally formed into a ring-shaped closed pattern.

Alternatively, the ink layer 500 completely covers the non-display area NA. That is, the orthographic projection of ink layer 500 on substrate 110 is completely coincident with non-display area AA.

Optionally, the ink layer 500 is manufactured by screen printing. For example, the first ink layer 510 and the second ink layer 520 are formed by silk-screen printing, respectively. Therefore, the manufacturing process is simpler, the silk-screen printing process is combined with the design of the non-closed ink-spreading layer, extra etching or multiple coating is not needed, and the printing is directly stopped at the required pattern cut-off position.

It should be noted that, in this embodiment, two ink layers (a first ink layer and a second ink layer) are taken as an example to be described, and the two ink layers can surround a projection closed pattern, and certainly the number of the ink layers is not limited in this application, and in other optional embodiments of this application, three, five or any number of non-closed annular ink layers can form a closed annular ink layer surrounding the display area together.

By the embodiment, the ink layer is arranged in the non-display area, so that the shading effect can be achieved, light is prevented from leaking from the non-display area, and the display effect is improved; meanwhile, the ink layer is set to be a closed ring formed by a plurality of ink layers, and each ink layer is in a non-closed ring shape, so that the ink layer can release stress through the non-closed ink layers while a good shading effect is achieved; moreover, the ink layer is arranged, so that the hardness of the frame area can be increased, and the edge of the display panel is prevented from warping.

Optionally, the ink layer 500 is located outside the basic display panel, i.e. at least on the film layer above the encapsulation layer 400. The influence of the ink layer 500 on the basic display panel, especially on the display layer in the display panel, is avoided.

Further, in some optional embodiments of the present application, the display panel further includes: the touch layer is positioned on one side, far away from the substrate, of the packaging layer, and/or the color film layer is positioned on one side, far away from the substrate, of the packaging layer; at least part of the ink layer is positioned on the surface of the touch layer or the color film layer.

For example, the functional layers (the first functional layer 610 and the second functional layer 620) in fig. 4 may be a touch layer or a color film layer.

Because the ink layer may be formed by a high temperature process, the ink layer is not directly formed on the encapsulation layer. The ink layer is manufactured on the touch layer or the color film layer, so that the loss of the packaging layer and the display device packaged by the packaging layer caused by manufacturing the ink layer can be avoided.

In some alternative embodiments of the present invention, the display panel 100 is a flexible display panel or a display panel that can be bent in some areas. Specifically, please refer to fig. 1 to fig. 4 with reference to fig. 5 and fig. 6, wherein fig. 5 is a top view of a first ink layer of a display panel according to an embodiment of the present invention; fig. 6 is a top view of a second ink layer of a display panel according to an embodiment of the present invention. The display panel comprises a bit bending area BB and non-bending areas NB positioned on two sides of the bending area BB.

It should be understood that, although the present embodiment only illustrates one bending region of the display panel, the present embodiment does not represent a limitation on the number and direction of the bending regions of the display panel. In this embodiment, there may be three, five or any number of bending regions, and only one bending region is selected for illustration in order to make the drawings clear and concise.

Optionally, the bending area BB is a strip-shaped area on the plane of the display panel and penetrating through the display panel. The bending region BB may have a bending axis Z, which may be understood as a bending path or a bending line of the bending region BB, and may also be understood as an axis surrounded by the display panel when the bending region BB is bent.

Optionally, the first ink layer 510 is located in the non-bending region NB; the second ink layer 520 is located in the bending area BB.

Optionally, at least part of orthographic projections of the first ink layer and the second ink layer on the substrate are overlapped, so that light leakage at a joint of the first ink layer and the second ink layer caused by stretching and dislocation of the ink layers during bending can be avoided. Such as the cross-sectional view shown in fig. 4, taken at the very region where the first and second ink layers overlap.

Of course, in other alternative embodiments of the present application, the area where the first ink layer and the second ink layer are located may be divided by taking the boundary between the bending region and the non-bending region as a boundary. That is to say, the first ink layer and the second ink layer are connected by the boundary, the orthographic projections of the first ink layer and the second ink layer on the substrate do not have large-area overlapping, and the boundary of the first ink layer and the second ink layer is cut off at the boundary of the bending area and the non-bending area. Therefore, the phenomenon that the section difference generated at the end part of the ink layer at the overlapped part of the ink layer and the ink layer is too complex and stress concentration is generated is avoided.

Optionally, the junction of the orthographic projections of the first ink layer 510 and the second ink layer 520 on the substrate 110 is located in the non-bending region NB. Can make linking department avoid the district of buckling like this, the printing ink layer leads to the linking department light leak on first printing ink layer and second printing ink layer because tensile, dislocation when avoiding buckling.

Through this embodiment, can make the printing ink layer guarantee whole encircle the display area, form the closed annular pattern that corresponds and shelter from the non-display area in, avoid buckling the printing ink layer fracture that display panel leads to. Each ink layer of the ink layer forms a non-closed pattern, which is beneficial to releasing bending stress. Simultaneously, the rete position of the ink layer of district will buckle is different from the rete position of the ink layer of non-district of buckling, disperses stress to different retes, can avoid leading to this rete place level stress too big with the layer setting.

In some alternative embodiments of the present invention, please refer to fig. 1 and 7-8, in which fig. 7 is another cross-sectional view taken along line a-a of fig. 1, and fig. 8 is another cross-sectional view taken along line B-B of fig. 1, the cross-section being perpendicular to the plane of the display panel. The same parts of this embodiment as those of the above embodiments will not be described again.

The display panel 100 further includes other functional film layers on the base display panel, such as a protective cover 600; the second ink layer 520 is located on a side adjacent to the protective cover 600. That is, the second ink layer 520 is located on the film layer adjacent to the protective cover 600

Specifically, the display panel 100 further includes a first functional layer 610 on a side of the encapsulation layer 400 away from the substrate 110, and a second functional layer 620 on a side of the first functional layer 610 away from the encapsulation layer 400.

Optionally, the first functional layer 610 is one or a combination of a color filter substrate (CF), a touch functional layer (TP) and a Polarizer (POL). The second functional layer 620 is a protective cover 600(cover film), and the optional protective cover is a window or glass cover.

It should be noted that the first functional layer 610 and the second functional layer 620 are usually an outer-hanging film layer, and are separately manufactured or purchased from a supplier and then attached to the base display panel. At least one side of the first functional layer 610 and the second functional layer 620 thus has a glue layer, typically a transparent optical glue, i.e. OCA.

However, the inventors have found that the first functional layer 610 is a film layer that needs to assist in complex operations such as optical adjustment, and the glue layer thereon cannot be made thick due to optical or electrical performance considerations. For example, functional films such as CF and the adhesive attached thereto for bonding are generally required to be manufactured together, that is, the OCA to which the functional layer is attached is manufactured by using the functional layer as a carrier substrate. The inventors have found that these optically functional films suffer from process limitations, where excessive OCA thickness affects yield (i.e., optical performance), and thus require thinner OCAs adjacent to the CF side. However, the smaller the OCA thickness, the poorer the coupling (which will be described in detail later on in the present description) can be, and therefore it is preferable that the ink layer in the bending region is disposed on the side adjacent to the protective cover.

Optionally, a first glue layer 710 is disposed on a side of the first functional layer 610 facing the package 400, and a second glue layer 720 is disposed on a side of the second functional layer 620 facing the first functional layer 610.

Optionally, the thickness of the first adhesive layer 710 is 15 to 25 μm; the thickness of the second adhesive layer 720 is 50 to 90 μm. The thickness here refers to the dimension of the glue layer in the direction perpendicular to the display panel.

Optionally, the second ink layer 520 is located between the cover plate 600 and the second glue layer 720. This can be favorable to covering the step formed at the edge of second ink layer 520 through second glue layer 720, can also be through the second ink layer 520 direct with second glue layer 720 contact better alleviating the bending stress of second ink layer 520.

The coupling of the adhesive layer as described in the present application is explained below. The inventor finds that when the functional film layer is arranged on the basic display panel, the planes of the functional film layers are kept neutral by the coupling property of the adhesive layer when the functional film layers are bent. Even if each functional film layer is not subjected to compressive stress due to bending and is not subjected to tensile stress due to bending. The adjacent film layers of the glue layer can be better coupled, and the coupling performance is better the farther the glue layer is.

Through this embodiment, when satisfying aforementioned technological effect, can also set up special design's printing ink layer to the bending region to stress risk when reducing to buckle. The second printing ink layer through with the bending zone sets up on having the adnexed protection apron of thicker glue film, neither can influence the yield of other functional layers, can utilize the second glue film to alleviate the bending stress on second printing ink layer again, when avoiding second printing ink layer to buckle the back damage such as crackle appear, can utilize the step that the flat second printing ink layer of second glue film formed and can cover the total thickness space that occupies of the printing ink sublayer that the layering set up through the second glue film.

Referring to fig. 1 in conjunction with fig. 9 and 10, fig. 9 is a schematic cross-sectional view of the frame of the display panel of fig. 1 extending along a direction perpendicular to the bending axis, and the cross-section is parallel to the circular path of the ink layer, i.e., a cross-section along a dashed line S in fig. 1. Fig. 10 is a schematic view of the cross section shown in fig. 9 in a state where the display panel is bent. In this embodiment, the internal structure of the display panel is the same as that of the above embodiments, and is not described again. It should be noted that, in the present application, for the convenience of viewing, for example, the gap is reserved when drawing between the film layers in fig. 9, and does not mean that other film layers must be disposed between the two film layers.

In contrast, the display panel includes at least two bending regions BB, and a non-bending region NB is spaced between the two bending regions BB. Optionally, the display panel 100 includes a plurality of bending regions BB and non-bending regions NB located between the bending regions BB; that is, along the first direction X, the bending regions BB and the non-bending regions NB are alternately arranged.

The bending regions BB include a first bending region BB1 and a second bending region BB2 with different bending directions. For example, the display panel includes two opposite sides, and the bending axes of the first bending region BB1 and the second bending region BB2 are respectively located at different sides of the display panel, so when the first bending region BB1 and the second bending region BB2 are respectively bent around the bending axes, one of the first bending region BB1 and the second bending region BB2, after being bent, will make the display surface of the region located at the concave side of the display panel, and after being bent, the other bending region will make the display surface of the region located at the convex side of the display panel.

The first ink layer 510 is at least partially located at the first bending area BB 1. Optionally, the first ink layer 510 further extends to a non-bending region NB adjacent to the first bending region BB1, i.e. the first ink layer is only located in the bending region and the non-bending region in the same bending direction as the first bending region. The first ink layer is not located in the region opposite to the bending direction of the first bending region. Of course, in some other alternative embodiments, the first ink layer is only located at the first bending region.

The second ink layer 520 is at least partially located at the second folding area BB 2. Optionally, the second ink layer further extends to a non-bending region adjacent to the second bending region, that is, the second ink layer is only located in the bending region and the non-bending region in the same bending direction as the second bending region. The second ink layer is not located in the region opposite to the bending direction of the second bending region. Of course, in some other alternative embodiments, the second ink layer is only located at the second bending region.

Through this embodiment, the bending region direction of buckling is different, corresponds different bending region settings with the ink layer on different layers, avoids same ink layer to bear the stress of equidirectional simultaneously, leads to ink layer both ends or both sides all to be difficult to have the release or alleviate the region of stress.

Optionally, the display panel 100 includes at least one glue layer. Optionally, the adhesive layer is an Optically Clear Adhesive (OCA). By this design, the bending difference of the ink layers at the different bending regions can be mitigated by the glue layer (see description of coupling above).

Optionally, in the bent state, the first ink layer 510 and/or the second ink layer 520 are located on the concave side of the functional layer bearing the ink layer. That is, the ink layer is formed by manufacturing a functional layer which is subsequently attached to the basic display panel as a substrate and screen-printing the functional layer thereon. And then the ink layer is attached to the basic display panel by an adhesive layer along with the attached functional layer.

In addition, the functional layer is referred to as a non-adhesive layer; i.e. the glue layer does not belong to the functional layer as in the examples of the present application.

Through this embodiment, what can make the regional printing ink layer of different buckles all received when buckling is compressive stress, avoids the printing ink layer to receive fracture behind the pulling force.

Further, the first ink layer 510 and the second ink layer 520 are respectively located on two opposite side surfaces of the adhesive layer; the side of the first ink layer 510, which faces away from the adhesive layer, is a first functional layer 610; the side of the second ink layer 520 opposite to the adhesive layer is a second functional layer 620;

under the state of bending: the first ink layer 510 is located on the concave side of the first functional layer 610 and the second ink layer 520 is located on the concave side of the second functional layer 620.

Specifically, the display panel 100 further includes a first functional layer 610 on a side of the encapsulation layer 400 away from the substrate 110. And a second functional layer 620 on a side of the first functional layer 610 remote from the illustrated encapsulation layer 400. The parts of the first functional layer 610 and the second functional layer 620 which are the same as those of the above embodiments are not described in detail.

A second glue layer 720 is further disposed between the first functional layer 610 and the second functional layer 620. The first ink layer 510 and the second ink layer 520 are respectively disposed on two sides of the second adhesive layer 720.

Through this embodiment, according to the different circumstances of buckling, depend on different functional layer settings with the china ink layer, utilize the glue film (for example second glue film 720), under the circumstances that need not increase other buffer film layer, can avoid buckling and cause the impact to the china ink layer. In addition, light leakage caused by a large vertical distance between the ink layers due to a large interval between the first ink layer 510 and the second ink layer 520 can be avoided.

In some alternative embodiments of the present application, as shown in fig. 11 and 12, fig. 11 is a schematic cross-sectional view of a frame of the display panel shown in fig. 1, the frame extending along a direction perpendicular to the bending axis, and the cross-section is parallel to the annular path of the ink layer, i.e., a cross-section along the dashed line S in fig. 1. Fig. 12 is a schematic view of the cross section shown in fig. 11 when the display panel is in a bent state. It should be noted that, in the present application, for convenience of viewing, for example, a gap is reserved when drawing between the film layers in fig. 11, and does not mean that other film layers must be arranged between the two film layers. In this embodiment, the internal structure of the display panel is the same as that of the above embodiments, and is not described again.

Optionally, the first functional layer 610 is a polarizer; the second functional layer 620 is a protective cover.

Optionally, the bending direction of the first bending area BB1 is inward bending, that is, after bending, the display surface of the display panel 100 in this area is opposite to the display surface, and the display surface faces inward; the protective cover 620 is located on the concave side of the display panel 100 in this area.

The second bending area BB2 is bent outward, i.e. opposite to the inward bending direction, and the display surface is outward after bending, and the protective cover 620 is located on the convex side of the display panel 100 in this area.

Optionally, the thickness of the first ink layer 610 is smaller than the thickness of the second ink layer 620.

The inventor researches and discovers that the bending radius of the inner bend and the outer bend is different due to the tension of the cover and the like, and the bending radius of the outer bend is larger than that of the inner bend. That is, the inner curve bends more easily and more sharply, with a greater degree of bending, greater curvature, and a smaller radius of curvature. The compressive stress experienced by first ink layer 610 in the inwardly bent bending region (i.e., first bending region BB1) is greater than the compressive stress experienced by second ink layer 620 in the outwardly bent bending region (i.e., second bending region BB 2). That is, the first bending zone BB1 can be easily bent to a great extent once it is bent by a force.

Therefore, through the embodiment, in order to prevent the ink layer from being wrinkled due to the larger pressure stress when the ink layer is bent in a small radius, the ink layer in the inward bending region and the ink layer in the outward bending region are set to have different thicknesses, that is, the thickness of the first ink layer 610 is smaller than that of the second ink layer 620, so that the wrinkle of the first ink layer in the inward bending region can be avoided. Because the thickness of the first ink layer 610 is small, large stress is not easy to generate, wrinkles are not easy to appear, and even if the bending degree is large, the adjacent film layers are not easy to break or wrinkle, and the influence on the adjacent film layers is avoided. The ink layer with special design can be arranged aiming at the bending area so as to reduce the stress risk during bending.

In addition, combine the analysis of above, through the second printing ink layer setting with the bending zone on having the adnexed protection apron of thicker glue film, neither can influence the yield of other functional layers, can utilize the second glue film to alleviate the bending stress on second printing ink layer again, when avoiding second printing ink layer to buckle the damage such as crackle appearing, can utilize the step that the flat second printing ink layer of second glue film formed and can cover the total thickness space that occupies that the printing ink sublayer that the layering set up reduces through the second glue film.

In some alternative embodiments of the present application, as shown in fig. 13, fig. 13 is a schematic cross-sectional view of a frame of the display panel in fig. 1, the frame extending along a direction perpendicular to the bending axis, and the cross-section is parallel to the annular path of the ink layer, i.e., a cross-section along the dashed line S in fig. 1. The same parts of this embodiment as those of the above embodiments will not be described again. It should be noted that, in the present application, for convenience of viewing, a gap is reserved when drawing between the films in fig. 13, which does not mean that other films must be disposed between the two films.

In contrast, the display panel 100 includes a third functional layer 630, where the third functional layer 630 is the same as the first functional layer 610 and is not repeated herein.

The first ink layer 510 and the second ink layer 520 are respectively disposed on two opposite surfaces of the third functional layer 630. That is, the first ink layer 510 and the second ink layer 520 are adjacent to both sides of the third functional layer, respectively.

Optionally, the first ink layer 510 and the second ink layer 520 are respectively formed or attached on the surface of the third functional layer 630.

Optionally, the third functional layer 630 is a polarizer.

Optionally, the third functional layer 630 is a non-outermost functional layer of the display panel. The third functional layer 630 is sequentially provided with a second glue layer 720 and a second functional layer 620 on the side deviating from the first glue layer 710.

Through this embodiment, first, the first ink layer 510 and the second ink layer 520 located in different bending regions are respectively disposed on the surfaces of different sides of the third functional layer, so as to ensure that the ink layers in each region all receive compressive stress. Secondly, because there is the glue film third functional layer both sides, consequently neutral plane is stable on it, and the stress of buckling is controllable, so set up the glossy ink layer and buckle the reliability improvement in third functional layer both sides. Moreover, the first ink layer 510 and the second ink layer 520 are disposed on two sides of the same functional film layer, so that the problem that the vertical distance between the ink layers is large and light leakage occurs due to the fact that the film layers with more intervals are arranged between the first ink layer 510 and the second ink layer 520 can be avoided. In addition, the third functional layer 630 (polarizer) is less strained when bent, so the overlap region C1 of the two sub-inks can be reduced to the printing tolerance range.

Of course, in other alternative embodiments of the present application, two ink layers may be printed on both sides of the second functional layer 620 (i.e. the protective cover film), and further, in order to prevent the outer ink layer from being damaged by friction, the surface of the ink layer needs to be covered with a protective film.

As shown in fig. 14, fig. 14 is a cross-sectional view of the display panel in a bent state shown in fig. 1 along a broken line S in fig. 1. The same parts of this embodiment as those of the above embodiments will not be described again.

In contrast, the bending radius of the first bending region BB1 is smaller than the bending radius of the second bending region BB 2. For ease of understanding, the center O of the bend radius is illustrated in fig. 14.

The first ink layer 510 is at least partially located in the first bending area BB 1; the second ink layer 520 is at least partially located in the second folding area BB 2; the thickness of the first ink layer 510 is less than the thickness of the second ink layer 520.

Through this embodiment, for preventing when the minor diameter is buckled, the printing ink layer receives great compressive stress and the fold appears, sets the ink layer in the inturn region and the ink layer in the excurvation region to different thickness, promptly the thickness of first printing ink layer 610 is less than the thickness of second printing ink layer 620 to the fold appears in the first printing ink layer in the inturn region can be avoided. Because the thickness of the first ink layer 610 is small, large stress is not easy to generate, wrinkles are not easy to appear, and even if the bending degree is large, the adjacent film layers are not easy to break or wrinkle, and the influence on the adjacent film layers is avoided.

Of course, in other alternative embodiments of the present application, as shown in fig. 15, fig. 15 is a schematic cross-sectional view of a frame of the display panel in fig. 1, which extends along a direction perpendicular to the bending axis, and the cross-section is parallel to the annular path of the ink layer, i.e., a cross-section along the dashed line S in fig. 1. The same parts of this embodiment as those of the above embodiments will not be described again. It should be noted that, in the present application, for convenience of viewing, a gap is reserved when drawing between the film layers in fig. 15, and other film layers are not necessarily arranged between the two film layers.

Here, the same parts of this embodiment as those of the above embodiments are not repeated, and different from these embodiments, the display panel includes at least one bending region BB and non-bending regions NB located at two sides of the bending region BB.

The junction of the orthographic projections of the first ink layer 510 and the second ink layer 520 on the substrate 110 is located at the bending area BB.

Through the embodiment, the joint of the first ink layer and the second ink layer can be actually regarded as the discontinuous position of the whole ink layer, namely, the joint of the ink layer and the ink layer is preset with a cut; with first printing ink layer with the handing-over department setting on the bending area of second printing ink layer, also make the preset department of truncation of printing ink layer set up in the bending area, the bending area stress is great after display panel buckles, tensile degree is also great, the department of truncation that will predetermine sets up in the bending area, even the printing ink layer because buckle and take place shrink or displacement, because be not continuous at the bending area printing ink layer, consequently, the printing ink layer can take place to remove or warp through directly setting up in the department of truncation in the bending area, release stress more easily, improve the reliability of buckling.

In another alternative embodiment of the present application, as shown in fig. 16, fig. 16 is a schematic cross-sectional view of a frame of the display panel shown in fig. 1, the frame extending along a direction perpendicular to the bending axis, and the cross-section is parallel to the annular path of the ink layer, i.e. the cross-section along the dashed line S in fig. 1. The same parts of this embodiment as those of the above embodiments will not be described again. It should be noted that, in the present application, for convenience of viewing, a gap is reserved when drawing between the films in fig. 16, and other films must not be arranged between the two films.

The same parts of this embodiment as those of the above embodiment are not described again, but different, and the display panel is a bendable display panel; and the first ink layers and the second ink layers are alternately arranged along the plane of the display panel and in the direction perpendicular to the bending axis. That is, along the direction of the dotted line S in fig. 1, the first ink layer 510 includes a plurality of sub-segments, and the plurality of sub-segments are sequentially spaced along the direction of the dotted line S. Similarly, along the direction of the dotted line S in fig. 1, the second ink layer 520 includes a plurality of sub-segments, and the plurality of sub-segments are sequentially spaced along the direction of the dotted line S. Along the direction of dashed line S in fig. 1, the orthographic projections of first ink layer 510 and second ink layer 520 on substrate 110 alternate.

By the embodiment, the ink layers are alternately arranged at different layers, and one ink layer is arranged in a broken and continuous state similar to a dotted line, so that overlarge stress of the interface level caused by adding the ink layer to a certain layer of film layer can be avoided; the stress release is facilitated; cracks can also be avoided extending along the ink layer.

In another alternative embodiment of the present application, as shown in fig. 17, fig. 17 is a schematic cross-sectional view of a frame of the display panel shown in fig. 1, the frame extending along a direction perpendicular to the bending axis, and the cross-section is parallel to the annular path of the ink layer, i.e., a cross-section along the dashed line S in fig. 1. The same parts of this embodiment as those of the above embodiments will not be described again. It should be noted that, in the present application, for convenience of viewing, a gap is reserved when drawing between the film layers in fig. 17, and other film layers are not necessarily arranged between the two film layers.

Unlike the above embodiments, the ink layer 500 further includes a third ink layer 530, and a junction of orthographic projections of the first ink layer 510 and the second ink layer 520 on the substrate 110 overlaps with an orthographic projection of the third ink layer 530 on the substrate 110.

Optionally, the joint of the first ink layer 510 and the second ink layer 520 is located in the non-bending region NB; the third ink layer 530 is located in the non-bending region NB. The problem that the bending stress is increased due to the fact that the area with more overlapped layers of the ink layers on different layers is located in the bending area can be solved.

By the embodiment, the third ink layer is added for reinforcement design, so that light leakage caused by a gap at the joint of the first ink layer and the second ink layer after relative displacement caused by bending can be avoided; the bending reliability of the ink layer is improved.

Referring to any of the above embodiments, i.e. the drawings, the display panel is a bendable display panel, and the first ink layer and the second ink layer are overlapped along the plane of the display panel and perpendicular to the direction of the bending axis, and the overlapped length is not less than 0.3 mm. Specifically, the length C1 of the overlapping area of first ink layer 510 and second ink layer 520 in the extending direction of ink layer 500 is greater than or equal to 0.3 mm.

The inventors have found that at least the following misalignment may occur to cause the first ink layer 510 and the second ink layer 520 to deviate in position: the laminating deviation (about 50-100 um), the process deviation when the printing ink layer is manufactured, and the deviation caused by the dislocation of the film layer after the display panel is bent, namely, the influence of the three main factors. It is understood that references herein to overlapping or abutting two spaced-apart film layers means that the orthographic projections of the two film layers on the substrate overlap or abut, unless otherwise specified. The extending direction of the ink layer is the annular path of the annular ink layer. For example, the ink layer is in a ring shape surrounding the display area or in a shape that exactly corresponds to the non-display area, and the extending direction of the ink layer at a certain position is the extending direction of the adjacent display area edge or the adjacent frame at the position.

By the embodiment, errors of the ink layer caused by other processes can be compensated through layered arrangement while the ink layer is prevented from being broken after being bent; further avoid the light leak of printing ink layer, improve the reliability of buckling of printing ink layer.

The invention further provides a manufacturing method of any one of the display panels, as shown in fig. 18, fig. 18 is a flowchart of manufacturing a display panel according to an embodiment of the invention.

The manufacturing method of the display panel comprises the step of sequentially arranging a substrate, an array layer, a display layer and a packaging layer on a bearing substrate. Optionally, the carrier substrate is a glass substrate.

And then forming an ink layer in a silk-screen printing mode. Optionally, after the packaging layer is manufactured, a first ink layer and a second ink layer are formed by silk-screen printing respectively. Optionally, the manufacturing method further includes attaching a functional layer after the manufacturing of the encapsulation layer is completed, and the ink layer is attached to the basic display panel through the functional layer after being formed on the functional layer in a silk-screen printing mode.

Then, the substrate (and the film layer on the substrate) is peeled off from the carrier substrate by laser lift-off. That is, the step of peeling the display panel from the carrier substrate is at least after the ink layer is formed.

Through this embodiment in market, can increase the hardness in frame district through the printing ink layer when avoiding the light leak of non-display area, take off from bearing the base plate at flexible substrate, can avoid display panel's edge to take place the warpage to through the design of the non-closed loop of printing ink layer of this application design, can make the anti-stress of warping in-process of frame district printing ink layer obtain releasing.

The invention also provides a display device which comprises the display panel provided by the invention. As shown in fig. 19, fig. 19 is a schematic structural diagram of a display device according to an embodiment of the present invention. The display device 1000 includes the display panel 100 according to any of the above embodiments of the present invention. The embodiment of fig. 19 is only an example of a mobile phone, and the display device 1000 is described, but it should be understood that the display device provided in the embodiment of the present invention may be other display devices having a display function, such as a computer, a television, and a vehicle-mounted display device, and the present invention is not limited thereto. The display device provided in the embodiment of the present invention has the beneficial effects of the display panel provided in the embodiment of the present invention, and specific reference may be made to the specific description of the display panel in each of the above embodiments, which is not repeated herein.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims

1. A display panel, wherein the display panel is divided into a display area and a non-display area surrounding the display area;

the orthographic projection of the first ink layer on the substrate is a non-closed pattern surrounding the display area;

the orthographic projection of the second ink layer on the substrate is a non-closed pattern surrounding the display area.

2. The display panel of claim 1,

the display panel also comprises a bending area and non-bending areas positioned on two sides of the bending area;

the first ink layer is positioned in the non-bending area;

the second ink layer is located in the bending area.

3. The display panel of claim 1,

the display panel further comprises a protective cover plate;

the second ink layer is located on the film layer adjacent to the protective cover plate.

4. The display panel according to claim 3, wherein the bending region includes a first bending region and a second bending region having different bending directions;

the first ink layer is at least partially positioned in the first bending area;

the second ink layer is at least partially located in the second bending area.

5. The display panel of claim 4, wherein the display panel comprises at least one glue layer.

6. The display panel of claim 5, wherein the first ink layer and/or the second ink layer is located on a concave side of the functional layer bearing the ink layer in a bent state.

7. The display panel of claim 6, wherein the first ink layer and the second ink layer are respectively located on two opposite side surfaces of the glue layer;

the side of the first ink layer, which faces away from the adhesive layer, is provided with a first functional layer;

the side, back to the adhesive layer, of the second ink layer is a second functional layer;

under the state of bending: the first ink layer is located on the concave side of the first functional layer, and the second ink layer is located on the concave side of the second functional layer.

8. The display panel of claim 7, wherein the first functional layer is a polarizer; the second functional layer is a protective cover plate.

9. The display panel of claim 8, wherein the thickness of the first ink layer is less than the thickness of the second ink layer.

10. The display panel of claim 6, wherein the first ink layer and the second ink layer are on opposite sides of the third functional layer.

11. The display panel according to claim 1, wherein the display panel comprises a first bending region and a second bending region, and a bending radius of the first bending region is smaller than a bending radius of the second bending region;

the first ink layer is at least partially positioned in the first bending area;

the second ink layer is at least partially positioned in the second bending area;

the thickness of the first ink layer is smaller than that of the second ink layer.

12. The display panel according to claim 1, wherein the display panel includes at least one bending region and non-bending regions at both sides of the bending region;

the junction of the orthographic projections of the first ink layer and the second ink layer on the substrate is positioned in the bending area.

13. The display panel according to claim 1, wherein the display panel is a bendable display panel;

and the first ink layers and the second ink layers are alternately arranged along the plane of the display panel and in the direction perpendicular to the bending axis.

14. The display panel of claim 1, wherein the ink layers further comprise a third ink layer, and a junction of orthographic projections of the first ink layer and the second ink layer on the substrate overlaps with an orthographic projection of the third ink layer on the substrate.

15. The display panel of claim 1, wherein the display panel is a bendable display panel, the first ink layer and the second ink layer overlap, and the length of the overlap is not less than 0.3mm in a direction perpendicular to the bending axis and in a plane of the display panel.

16. The display panel of claim 1, wherein the display panel further comprises: the touch layer is positioned on one side, far away from the substrate, of the packaging layer, and/or the color film layer is positioned on one side, far away from the substrate, of the packaging layer;

at least part of the ink layer is positioned on the film layer adjacent to the touch layer or the color film layer.

17. The display panel of claim 1, wherein the ink layer is screen printed.

18. A display device, comprising:

the display panel of any one of claims 1-17.

19. A method for manufacturing a display panel, the method being applied to the display panel of claims 1-18, comprising:

sequentially arranging a substrate, an array layer, a display layer and a packaging layer;

the printing ink layer is formed in a silk-screen printing mode.

20. The method of manufacturing of claim 19,

the substrate is formed on the bearing substrate;

the step of peeling the display panel from the carrier substrate is at least after the ink layer is formed.